1 Answer
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The first exception complains about multiple entity in the same Table-per-hierarchy inheritance without distinct condition - make sure that you set unique filter on PolicyType (or other column) for every entity in inheritance tree.

The second exception complains about mapping column used for condition to a property. Once you use any column for condition you cannot have it mapped to property (except the situation when the condition is IsNull=False). The column is already used to map entity type and no column can be used in mapping twice.